explored in a new film premiering tonight on pbs. >> that is adam, age four and half walking toward the camera. >> more pieces of a tragic puzzle that may never be complete. >> are we ever going to know why? there may be to people who know that answer and they are not here to tell us. >> gone now, along with 26 innocent victims. >> we will have more on a killing spree and standoff that captivated the nation and ended with the death of an ex l.a. cop. >> tonight, los angeles please speak out for the first time. but they have to say about claims of racism in that police department. >> it crashed and dress in prince william county and out of control kids are to blame. [ male announcer ] so there's lots of people out there who aren't happy with their internet. [ spokesman ] are you lindsay? yes... did you say, "my internet's so slow it's like a car with no gas"? yes... [ male announcer ] well lindsay, you're about to get verizon fios quantum, america's fastest, most reliable internet. so that's what you used to have... okay. and that's fios. wow, this is crazy fast, almost unbelievable.